git.sesse.net Git - vlc/blob - modules/codec/cinepak/cinepak.c

   1 /*****************************************************************************
   2  * cinepak.c: cinepak video decoder
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: cinepak.c,v 1.5 2002/10/24 09:37:48 gbazin Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc/vout.h>
  31 #include <vlc/decoder.h>
  32 #include <vlc/input.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>                                              /* getpid() */
  36 #endif
  37
  38 #include <errno.h>
  39 #include <string.h>
  40
  41 #ifdef HAVE_SYS_TIMES_H
  42 #   include <sys/times.h>
  43 #endif
  44
  45 #include "cinepak.h"
  46
  47 /*****************************************************************************
  48  * Local prototypes
  49  *****************************************************************************/
  50 static int      OpenDecoder     ( vlc_object_t * );
  51 static int      RunDecoder      ( decoder_fifo_t * );
  52 static int      InitThread      ( videodec_thread_t * );
  53 static void     EndThread       ( videodec_thread_t * );
  54 static void     DecodeThread    ( videodec_thread_t * );
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 vlc_module_begin();
  60     set_description( "Cinepak video decoder" );
  61     set_capability( "decoder", 70 );
  62     set_callbacks( OpenDecoder, NULL );
  63 vlc_module_end();
  64
  65 /*****************************************************************************
  66  * OpenDecoder: probe the decoder and return score
  67  *****************************************************************************
  68  * Tries to launch a decoder and return score so that the interface is able
  69  * to chose.
  70  *****************************************************************************/
  71 static int OpenDecoder( vlc_object_t *p_this )
  72 {
  73     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
  74
  75     switch( p_fifo->i_fourcc )
  76     {
  77         case VLC_FOURCC('c','v','i','d'):
  78         case VLC_FOURCC('C','V','I','D'):
  79             p_fifo->pf_run = RunDecoder;
  80             return VLC_SUCCESS;
  81     }
  82
  83     return VLC_EGENERIC;
  84 }
  85
  86 /*****************************************************************************
  87  * RunDecoder: this function is called just after the thread is created
  88  *****************************************************************************/
  89 static int RunDecoder( decoder_fifo_t *p_fifo )
  90 {
  91     videodec_thread_t   *p_vdec;
  92     int b_error;
  93
  94     if ( !(p_vdec = (videodec_thread_t*)malloc( sizeof(videodec_thread_t))) )
  95     {
  96         msg_Err( p_fifo, "out of memory" );
  97         DecoderError( p_fifo );
  98         return( -1 );
  99     }
 100     memset( p_vdec, 0, sizeof( videodec_thread_t ) );
 101
 102     p_vdec->p_fifo = p_fifo;
 103
 104     if( InitThread( p_vdec ) != 0 )
 105     {
 106         DecoderError( p_fifo );
 107         return( -1 );
 108     }
 109
 110     while( (!p_vdec->p_fifo->b_die) && (!p_vdec->p_fifo->b_error) )
 111     {
 112         DecodeThread( p_vdec );
 113     }
 114
 115     if( ( b_error = p_vdec->p_fifo->b_error ) )
 116     {
 117         DecoderError( p_vdec->p_fifo );
 118     }
 119
 120     EndThread( p_vdec );
 121
 122     if( b_error )
 123     {
 124         return( -1 );
 125     }
 126
 127     return( 0 );
 128 }
 129
 130
 131 /*****************************************************************************
 132  * locales Functions
 133  *****************************************************************************/
 134
 135 static inline u16 GetWBE( u8 *p_buff )
 136 {
 137     return( (p_buff[0]<<8) + p_buff[1] );
 138 }
 139
 140 static inline u32 GetDWBE( u8 *p_buff )
 141 {
 142     return( (p_buff[0] << 24) + ( p_buff[1] <<16 ) +
 143             ( p_buff[2] <<8 ) + p_buff[3] );
 144 }
 145
 146 #define GET2BYTES( p ) \
 147     GetWBE( p ); p+= 2;
 148 /* FIXME */
 149 #define GET3BYTES( p ) \
 150     (GetDWBE( p ) >> 8); p+= 3;
 151
 152 #define GET4BYTES( p ) \
 153     GetDWBE( p ); p+= 4;
 154
 155 #define FREE( p ) \
 156     if( p ) free( p )
 157
 158
 159 static inline void __GetFrame( videodec_thread_t *p_vdec )
 160 {
 161     pes_packet_t  *p_pes;
 162     data_packet_t *p_data;
 163     byte_t        *p_buffer;
 164
 165     p_pes = GetPES( p_vdec->p_fifo );
 166     p_vdec->i_pts = p_pes->i_pts;
 167
 168     while( ( !p_pes->i_nb_data )||( !p_pes->i_pes_size ) )
 169     {
 170         p_pes = NextPES( p_vdec->p_fifo );
 171     }
 172     p_vdec->i_framesize = p_pes->i_pes_size;
 173     if( p_pes->i_nb_data == 1 )
 174     {
 175         p_vdec->p_framedata = p_pes->p_first->p_payload_start;
 176         return;
 177     }
 178     /* get a buffer and gather all data packet */
 179     p_vdec->p_framedata = p_buffer = malloc( p_pes->i_pes_size );
 180     p_data = p_pes->p_first;
 181     do
 182     {
 183         p_vdec->p_fifo->p_vlc->pf_memcpy( p_buffer, p_data->p_payload_start,
 184                      p_data->p_payload_end - p_data->p_payload_start );
 185         p_buffer += p_data->p_payload_end - p_data->p_payload_start;
 186         p_data = p_data->p_next;
 187     } while( p_data );
 188 }
 189
 190 static inline void __NextFrame( videodec_thread_t *p_vdec )
 191 {
 192     pes_packet_t  *p_pes;
 193
 194     p_pes = GetPES( p_vdec->p_fifo );
 195     if( p_pes->i_nb_data != 1 )
 196     {
 197         free( p_vdec->p_framedata ); /* FIXME keep this buffer */
 198     }
 199     NextPES( p_vdec->p_fifo );
 200 }
 201
 202 static int cinepak_CheckVout( vout_thread_t *p_vout,
 203                               int i_width,
 204                               int i_height )
 205 {
 206     if( !p_vout )
 207     {
 208         return( 0 );
 209     }
 210
 211     if( ( p_vout->render.i_width != i_width )||
 212         ( p_vout->render.i_height != i_height )||
 213         ( p_vout->render.i_chroma != VLC_FOURCC('I','4','2','0') )||
 214         ( p_vout->render.i_aspect != VOUT_ASPECT_FACTOR * i_width / i_height) )
 215     {
 216         return( 0 );
 217     }
 218     else
 219     {
 220         return( 1 );
 221     }
 222 }
 223
 224 /* Return a Vout */
 225
 226 static vout_thread_t *cinepak_CreateVout( videodec_thread_t *p_vdec,
 227                                          int i_width,
 228                                          int i_height )
 229 {
 230     vout_thread_t *p_vout;
 231
 232     if( (!i_width)||(!i_height) )
 233     {
 234         return( NULL ); /* Can't create a new vout without display size */
 235     }
 236
 237     /* Spawn a video output if there is none. First we look for our children,
 238      * then we look for any other vout that might be available. */
 239     p_vout = vlc_object_find( p_vdec->p_fifo, VLC_OBJECT_VOUT,
 240                                               FIND_CHILD );
 241     if( !p_vout )
 242     {
 243         p_vout = vlc_object_find( p_vdec->p_fifo, VLC_OBJECT_VOUT,
 244                                                   FIND_ANYWHERE );
 245     }
 246
 247     if( p_vout )
 248     {
 249         if( !cinepak_CheckVout( p_vout, i_width, i_height ) )
 250         {
 251             /* We are not interested in this format, close this vout */
 252             vlc_object_detach( p_vout );
 253             vlc_object_release( p_vout );
 254             vout_DestroyThread( p_vout );
 255             p_vout = NULL;
 256         }
 257         else
 258         {
 259             /* This video output is cool! Hijack it. */
 260             vlc_object_detach( p_vout );
 261             vlc_object_attach( p_vout, p_vdec->p_fifo );
 262             vlc_object_release( p_vout );
 263         }
 264     }
 265
 266     if( p_vout == NULL )
 267     {
 268         msg_Dbg( p_vdec->p_fifo, "no vout present, spawning one" );
 269
 270         p_vout = vout_CreateThread( p_vdec->p_fifo,
 271                                     i_width,
 272                                     i_height,
 273                                     VLC_FOURCC('I','4','2','0'),
 274                                     VOUT_ASPECT_FACTOR * i_width / i_height );
 275     }
 276
 277     return( p_vout );
 278 }
 279
 280 void cinepak_LoadCodebook( cinepak_codebook_t *p_codebook,
 281                            u8 *p_data,
 282                            int b_grayscale )
 283 {
 284     int i, i_y[4], i_u, i_v, i_Cb, i_Cr;
 285     int i_uv;
 286 #define SCALEBITS 12
 287 #define FIX( x ) ( (int)( (x) * ( 1L << SCALEBITS ) + 0.5 ) )
 288
 289     for( i = 0; i < 4; i++ )
 290     {
 291         i_y[i] = (u8)( *(p_data++) );
 292     }
 293     if( b_grayscale )
 294     {
 295         i_u  = (s8)( *(p_data++) );
 296         i_v  = (s8)( *(p_data++) );
 297     }
 298     else
 299     {
 300         i_u  = 0;
 301         i_v  = 0;
 302     }
 303
 304     /*
 305           | Y  |   | 1 -0.0655  0.0110 | | CY |
 306           | Cb | = | 0  1.1656 -0.0062 | | CU |
 307           | Cr |   | 0  0.0467  1.4187 | | CV |
 308      */
 309     i_uv = ( FIX( -0.0655 ) * i_u + FIX( 0.0110 ) * i_v ) >> SCALEBITS;
 310     for( i = 0; i < 4; i++ )
 311     {
 312         i_y[i] += i_uv;
 313     }
 314     i_Cb  = ( FIX( 1.1656 ) * i_u + FIX( -0.0062 ) * i_v ) >> SCALEBITS;
 315     i_Cr  = ( FIX( 0.0467 ) * i_u + FIX(  1.4187 ) * i_v ) >> SCALEBITS;
 316
 317     for( i = 0; i < 4; i++ )
 318     {
 319         p_codebook->i_y[i] = __MIN( __MAX( 0, i_y[i] ), 255 );
 320     }
 321     p_codebook->i_u  = __MIN( __MAX( 0, i_Cb + 128 ), 255 );
 322     p_codebook->i_v  = __MIN( __MAX( 0, i_Cr + 128 ), 255 );
 323
 324 #undef FIX
 325 #undef SCALEBITS
 326 }
 327
 328 void cinepak_Getv4( cinepak_context_t *p_context,
 329                     int i_strip,
 330                     int i_x,  int i_y,
 331                     int i_x2, int i_y2,
 332                     u8 *p_data )
 333 {
 334     u8 i_index[4];
 335     int i,j;
 336
 337     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 338 #define PIX_SET_Y( x, y, v ) \
 339     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 340
 341 #define PIX_SET_UV( i, p, x, y, v ) \
 342     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 343
 344     for( i = 0; i < 4; i++ )
 345     {
 346         i_index[i] = *(p_data++);
 347     }
 348
 349     /* y plane */
 350     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 351     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 352     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 353
 354     for( i = 0; i < 2; i++ )
 355     {
 356         for( j = 0; j < 2; j ++ )
 357         {
 358             PIX_SET_Y( 2*j + 0, 2*i + 0,
 359                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[0]);
 360             PIX_SET_Y( 2*j + 1, 2*i + 0,
 361                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[1]);
 362             PIX_SET_Y( 2*j + 0, 2*i + 1,
 363                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[2]);
 364             PIX_SET_Y( 2*j + 1, 2*i + 1,
 365                        p_context->codebook_v4[i_strip][i_index[j+2*i]].i_y[3]);
 366
 367             PIX_SET_UV( 1, p_dst_u, j, i,
 368                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_u );
 369             PIX_SET_UV( 2, p_dst_v, j, i,
 370                         p_context->codebook_v4[i_strip][i_index[j+2*i]].i_v );
 371         }
 372     }
 373 #undef PIX_SET_Y
 374 #undef PIX_SET_UV
 375 }
 376
 377 void cinepak_Getv1( cinepak_context_t *p_context,
 378                     int i_strip,
 379                     int i_x,  int i_y,
 380                     int i_x2, int i_y2,
 381                     u8 *p_data )
 382 {
 383     u8 i_index;
 384     int i,j;
 385
 386     u8 *p_dst_y, *p_dst_u, *p_dst_v;
 387 #define PIX_SET_Y( x, y, v ) \
 388     p_dst_y[(x) + (y)* p_context->i_stride[0]] = (v);
 389
 390 #define PIX_SET_UV( i,p, x, y, v ) \
 391     p[(x) + (y)* (p_context->i_stride[i])] = (v);
 392
 393     i_index = *(p_data++);
 394
 395     /* y plane */
 396     p_dst_y = p_context->p_pix[0] + p_context->i_stride[0] * i_y + i_x;
 397     p_dst_u = p_context->p_pix[1] + p_context->i_stride[1] * (i_y/2) + (i_x/2);
 398     p_dst_v = p_context->p_pix[2] + p_context->i_stride[2] * (i_y/2) + (i_x/2);
 399
 400     for( i = 0; i < 2; i++ )
 401     {
 402         for( j = 0; j < 2; j ++ )
 403         {
 404             PIX_SET_Y( 2*j + 0, 2*i + 0,
 405                        p_context->codebook_v1[i_strip][i_index].i_y[0] );
 406             PIX_SET_Y( 2*j + 1, 2*i + 0,
 407                        p_context->codebook_v1[i_strip][i_index].i_y[1] );
 408             PIX_SET_Y( 2*j + 0, 2*i + 1,
 409                        p_context->codebook_v1[i_strip][i_index].i_y[2] );
 410             PIX_SET_Y( 2*j + 1, 2*i + 1,
 411                        p_context->codebook_v1[i_strip][i_index].i_y[3] );
 412
 413             PIX_SET_UV( 1,p_dst_u, j, i,
 414                         p_context->codebook_v1[i_strip][i_index].i_u );
 415             PIX_SET_UV( 2,p_dst_v, j, i,
 416                         p_context->codebook_v1[i_strip][i_index].i_v );
 417         }
 418     }
 419
 420 #undef PIX_SET_Y
 421 #undef PIX_SET_UV
 422 }
 423
 424 /*****************************************************************************
 425  * The function that decode one frame
 426  *****************************************************************************/
 427 int cinepak_decode_frame( cinepak_context_t *p_context,
 428                           int i_length, u8 *p_data )
 429 {
 430     int i_strip;
 431
 432     int i_frame_flags;
 433     int i_frame_size;
 434     int i_width, i_height;
 435     int i_frame_strips;
 436     int i_index;
 437     int i_strip_x1 =0, i_strip_y1=0;
 438     int i_strip_x2 =0, i_strip_y2=0;
 439
 440     if( i_length <= 10 )
 441     {
 442         /* Broken header or no data */
 443         return( -1 );
 444     }
 445
 446     /* get header */
 447     i_frame_flags  = *(p_data++);
 448     i_frame_size = GET3BYTES( p_data );
 449     i_width  = GET2BYTES( p_data );
 450     i_height = GET2BYTES( p_data );
 451     i_frame_strips = GET2BYTES( p_data );
 452
 453     /* Check if we have a picture buffer with good size */
 454     if( ( p_context->i_width != i_width )||
 455         ( p_context->i_height != i_height ) )
 456     {
 457         int i;
 458         for( i = 0; i < 3; i++ )
 459         {
 460             FREE( p_context->p_pix[i] );
 461         }
 462
 463         p_context->i_width = i_width;
 464         p_context->i_height = i_height;
 465
 466         p_context->i_stride[0] = ( i_width + 3)&0xfffc;
 467         p_context->i_stride[1] = p_context->i_stride[2] =
 468                 p_context->i_stride[0] / 2;
 469
 470         p_context->i_lines[0] = ( i_height + 3 )&0xfffc;
 471         p_context->i_lines[1] = p_context->i_lines[2] =
 472                 p_context->i_lines[0] /2;
 473
 474         for( i = 0; i < 3; i++ )
 475         {
 476             p_context->p_pix[i] = malloc( p_context->i_stride[i] *
 477                                           p_context->i_lines[i] );
 478             /* Set it to all black */
 479             memset( p_context->p_pix[i], ( i == 0 ) ? 0 : 128 ,
 480                     p_context->i_stride[i] * p_context->i_lines[i] );
 481         }
 482     }
 483
 484     if( i_frame_size != i_length )
 485     {
 486         i_length = __MIN( i_length, i_frame_size );
 487     }
 488     i_length -= 10;
 489
 490     if( i_frame_strips >= CINEPAK_MAXSTRIP )
 491     {
 492         i_frame_strips = CINEPAK_MAXSTRIP;
 493     }
 494
 495     /* Now decode each strip */
 496
 497     for( i_strip = 0; i_strip < i_frame_strips; i_strip++ )
 498     {
 499         int i_strip_id;
 500         int i_strip_size;
 501
 502         if( i_length <= 12 )
 503         {
 504             break;
 505         }
 506
 507
 508         i_strip_id   = GET2BYTES( p_data );
 509         i_strip_size = GET2BYTES( p_data );
 510         i_strip_size = __MIN( i_strip_size, i_length );
 511         /* FIXME I don't really understand how it's work; */
 512         i_strip_y1  = i_strip_y2 + GET2BYTES( p_data );
 513         i_strip_x1  = GET2BYTES( p_data );
 514         i_strip_y2  = i_strip_y2 + GET2BYTES( p_data );
 515         i_strip_x2  = GET2BYTES( p_data );
 516
 517         i_length -= i_strip_size;
 518
 519         i_strip_size -= 12;
 520         /* init codebook , if needed */
 521         if( ( i_strip > 0 )&&( !(i_frame_flags&0x01) ) )
 522         {
 523             memcpy( &p_context->codebook_v1[i_strip],
 524                     &p_context->codebook_v1[i_strip-1],
 525                     sizeof(cinepak_codebook_t[256] ) );
 526
 527             memcpy( &p_context->codebook_v4[i_strip],
 528                     &p_context->codebook_v4[i_strip-1],
 529                     sizeof(cinepak_codebook_t[256] ) );
 530         }
 531
 532         /* Now parse all chunk in this strip */
 533         while( i_strip_size > 0 )
 534         {
 535             cinepak_codebook_t (*p_codebook)[CINEPAK_MAXSTRIP][256];
 536             int i_mode;
 537
 538             int i_chunk_id;
 539             int i_chunk_size;
 540             u32 i_vector_flags;
 541             int i_count;
 542             int i;
 543             int i_x, i_y; /* (0,0) begin in fact at (x1,y1) ... */
 544
 545             i_chunk_id   = GET2BYTES( p_data );
 546             i_chunk_size = GET2BYTES( p_data );
 547             i_chunk_size  = __MIN( i_chunk_size, i_strip_size );
 548             i_strip_size -= i_chunk_size;
 549
 550             i_chunk_size -= 4;
 551
 552             i_x = 0;
 553             i_y = 0;
 554             if( i_chunk_size < 0 )
 555             {
 556                 break;
 557             }
 558
 559             switch( i_chunk_id )
 560             {
 561                 case( 0x2000 ): /* 12bits v4 Intra*/
 562                 case( 0x2200 ): /* 12bits v1 Intra*/
 563                 case( 0x2400 ): /* 8bits v4 Intra*/
 564                 case( 0x2600 ): /* 8bits v1 Intra */
 565                     i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 566                     p_codebook = ( i_chunk_id&0x0200 ) ?
 567                                     &p_context->codebook_v1 :
 568                                     &p_context->codebook_v4;
 569
 570                     i_count = __MIN( i_chunk_size / ( i_mode ? 6 : 4 ), 256 );
 571
 572                     for( i = 0; i < i_count; i++ )
 573                     {
 574                         cinepak_LoadCodebook( &((*p_codebook)[i_strip][i]),
 575                                               p_data,
 576                                        i_mode&~p_context->b_grayscale );
 577                         p_data += i_mode ? 6 : 4;
 578                         i_chunk_size -= i_mode ? 6 : 4;
 579                     }
 580                     break;
 581
 582                 case( 0x2100 ): /* selective 12bits v4 Inter*/
 583                 case( 0x2300 ): /* selective 12bits v1 Inter*/
 584                 case( 0x2500 ): /* selective 8bits v4 Inter*/
 585                 case( 0x2700 ): /* selective 8bits v1 Inter*/
 586                     i_mode = ( ( i_chunk_id&0x0400 ) == 0 );
 587                     p_codebook = ( i_chunk_id&0x0200 ) ?
 588                                     &p_context->codebook_v1 :
 589                                     &p_context->codebook_v4;
 590
 591                     i_index = 0;
 592                     while( (i_chunk_size > 4)&&(i_index<256))
 593                     {
 594                         i_vector_flags = GET4BYTES( p_data );
 595                         i_chunk_size -= 4;
 596                         for( i = 0; i < 32; i++ )
 597                         {
 598                             if( ( i_chunk_size < ( i_mode ? 6 : 4 ) )||(i_index >= 256 ))
 599                             {
 600                                 break;
 601                             }
 602                             if( i_vector_flags&0x80000000UL )
 603                             {
 604                                 cinepak_LoadCodebook( &((*p_codebook)[i_strip][i_index]),
 605                                                       p_data,
 606                                             i_mode&~p_context->b_grayscale );
 607
 608                                 p_data += i_mode ? 6 : 4;
 609                                 i_chunk_size -= i_mode ? 6 : 4;
 610                             }
 611                             i_index++;
 612                             i_vector_flags <<= 1;
 613                         }
 614                     }
 615                     break;
 616
 617                 case( 0x3000 ): /* load image Intra */
 618                     while( (i_chunk_size >= 4 )&&(i_y<i_strip_y2-i_strip_y1) )
 619                     {
 620                         i_vector_flags = GET4BYTES( p_data );
 621                         i_chunk_size -= 4;
 622                         i_strip_size -= 4;
 623                         i_length     -= 4;
 624
 625                         for( i = 0; i < 32; i++ )
 626                         {
 627                             if( ( i_y >= i_strip_y2 - i_strip_y1)||
 628                                     ( i_chunk_size<=0) )
 629                             {
 630                                 break;
 631                             }
 632                             if( i_vector_flags&0x80000000UL )
 633                             {
 634                                 cinepak_Getv4( p_context,
 635                                                i_strip,
 636                                                i_strip_x1 + i_x,
 637                                                i_strip_y1 + i_y,
 638                                                i_strip_x2, i_strip_y2,
 639                                                p_data );
 640                                 p_data += 4;
 641                                 i_chunk_size -= 4;
 642                             }
 643                             else
 644                             {
 645                                 cinepak_Getv1( p_context,
 646                                                i_strip,
 647                                                i_strip_x1 + i_x,
 648                                                i_strip_y1 + i_y,
 649                                                i_strip_x2, i_strip_y2,
 650                                                p_data );
 651                                 p_data++;
 652                                 i_chunk_size--;
 653                             }
 654
 655                             i_x += 4;
 656                             if( i_x >= i_strip_x2 - i_strip_x1 )
 657                             {
 658                                 i_x = 0;
 659                                 i_y += 4;
 660                             }
 661                             i_vector_flags <<= 1;
 662                         }
 663                     }
 664                     break;
 665
 666                 case( 0x3100 ): /* load image Inter */
 667                     while( ( i_chunk_size > 4 )&&( i_y < i_strip_y2 - i_strip_y1) )
 668                     {
 669                         u32 i_mask;
 670                         i_vector_flags = GET4BYTES( p_data );
 671                         i_chunk_size -= 4;
 672                         i_mask = 0x80000000UL;
 673
 674                         while((i_chunk_size > 0 )&&( i_mask )&&( i_y < i_strip_y2 - i_strip_y1 ))
 675                         {
 676                             if( i_vector_flags&i_mask)
 677                             {
 678                                 i_mask >>= 1;
 679                                 if( !i_mask )
 680                                 {
 681                                     if( i_chunk_size < 4 )
 682                                     {
 683                                         break;
 684                                     }
 685                                     i_vector_flags = GET4BYTES( p_data );
 686                                     i_chunk_size -= 4;
 687                                     i_mask = 0x80000000UL;
 688                                 }
 689                                 if( i_vector_flags&i_mask )
 690                                 {
 691                                     if( i_chunk_size < 4 ) break;
 692                                     cinepak_Getv4( p_context,
 693                                                    i_strip,
 694                                                    i_strip_x1 + i_x,
 695                                                    i_strip_y1 + i_y,
 696                                                    i_strip_x2, i_strip_y2,
 697                                                    p_data );
 698                                     p_data += 4;
 699                                     i_chunk_size -= 4;
 700                                 }
 701                                 else
 702                                 {
 703                                     if( i_chunk_size < 1 ) break;
 704                                     cinepak_Getv1( p_context,
 705                                                    i_strip,
 706                                                    i_strip_x1 + i_x,
 707                                                    i_strip_y1 + i_y,
 708                                                    i_strip_x2, i_strip_y2,
 709                                                    p_data );
 710                                     p_data++;
 711                                     i_chunk_size--;
 712                                 }
 713                             }
 714                             i_mask >>= 1;
 715
 716                             i_x += 4;
 717                             if( i_x >= i_strip_x2 - i_strip_x1 )
 718                             {
 719                                 i_x = 0;
 720                                 i_y += 4;
 721                             }
 722                         }
 723                     }
 724                     break;
 725
 726                 case( 0x3200 ): /* load intra picture but all v1*/
 727                     while( ( i_chunk_size > 0 )&&
 728                            ( i_y < i_strip_y2 - i_strip_y1) )
 729                     {
 730                         cinepak_Getv1( p_context,
 731                                        i_strip,
 732                                        i_strip_x1 + i_x,
 733                                        i_strip_y1 + i_y,
 734                                        i_strip_x2, i_strip_y2,
 735                                        p_data );
 736                         p_data++;
 737                         i_chunk_size--;
 738
 739                         i_x += 4;
 740                         if( i_x >= i_strip_x2 - i_strip_x1 )
 741                         {
 742                             i_x = 0;
 743                             i_y += 4;
 744                         }
 745
 746                     }
 747                     break;
 748
 749
 750
 751                 default:
 752                     break;
 753
 754             }
 755             p_data += i_chunk_size ; /* skip remains bytes */
 756
 757         }
 758     }
 759
 760
 761     return( 0 );
 762 }
 763
 764
 765 /*****************************************************************************
 766  *
 767  * Functions that initialize, decode and end the decoding process
 768  *
 769  *****************************************************************************/
 770
 771 /*****************************************************************************
 772  * InitThread: initialize vdec output thread
 773  *****************************************************************************
 774  * This function is called from decoder_Run and performs the second step
 775  * of the initialization. It returns 0 on success. Note that the thread's
 776  * flag are not modified inside this function.
 777  *****************************************************************************/
 778
 779 static int InitThread( videodec_thread_t *p_vdec )
 780 {
 781
 782     /* This will be created after the first decoded frame */
 783     if( !(p_vdec->p_context = malloc( sizeof( cinepak_context_t ) ) ) )
 784     {
 785         msg_Err( p_vdec->p_fifo, "out of memory" );
 786     }
 787     memset( p_vdec->p_context, 0, sizeof( cinepak_context_t ) );
 788
 789     if( config_GetInt( p_vdec->p_fifo, "grayscale" ) )
 790     {
 791         p_vdec->p_context->b_grayscale = 1;
 792     }
 793     else
 794     {
 795         p_vdec->p_context->b_grayscale = 0;
 796     }
 797
 798     p_vdec->p_vout = NULL;
 799     msg_Dbg( p_vdec->p_fifo, "cinepak decoder started" );
 800     return( 0 );
 801 }
 802
 803
 804 /*****************************************************************************
 805  * DecodeThread: Called for decode one frame
 806  *****************************************************************************/
 807 static void  DecodeThread( videodec_thread_t *p_vdec )
 808 {
 809     int     i_status;
 810
 811     int i_plane;
 812     u8 *p_dst, *p_src;
 813     picture_t *p_pic; /* videolan picture */
 814
 815     __GetFrame( p_vdec );
 816
 817     i_status = cinepak_decode_frame( p_vdec->p_context,
 818                                      p_vdec->i_framesize,
 819                                      p_vdec->p_framedata );
 820     __NextFrame( p_vdec );
 821
 822     if( i_status < 0 )
 823     {
 824         msg_Warn( p_vdec->p_fifo, "cannot decode one frame (%d bytes)",
 825                                   p_vdec->i_framesize );
 826         return;
 827     }
 828
 829     /* Check our vout */
 830     if( !cinepak_CheckVout( p_vdec->p_vout,
 831                             p_vdec->p_context->i_width,
 832                             p_vdec->p_context->i_height ) )
 833     {
 834         p_vdec->p_vout =
 835           cinepak_CreateVout( p_vdec,
 836                               p_vdec->p_context->i_width,
 837                               p_vdec->p_context->i_height );
 838
 839         if( !p_vdec->p_vout )
 840         {
 841             msg_Err( p_vdec->p_fifo, "cannot create vout" );
 842             p_vdec->p_fifo->b_error = 1; /* abort */
 843             return;
 844         }
 845     }
 846
 847     /* Send decoded frame to vout */
 848     while( !(p_pic = vout_CreatePicture( p_vdec->p_vout, 0, 0, 0 ) ) )
 849     {
 850         if( p_vdec->p_fifo->b_die || p_vdec->p_fifo->b_error )
 851         {
 852             return;
 853         }
 854         msleep( VOUT_OUTMEM_SLEEP );
 855     }
 856
 857     for( i_plane = 0; i_plane < 3; i_plane++ )
 858     {
 859         int i_line, i_lines;
 860
 861         p_dst = p_pic->p[i_plane].p_pixels;
 862         p_src = p_vdec->p_context->p_pix[i_plane];
 863
 864         i_lines = __MIN( p_vdec->p_context->i_lines[i_plane],
 865                          p_pic->p[i_plane].i_lines );
 866         for( i_line = 0; i_line < i_lines; i_line++ )
 867         {
 868             memcpy( p_dst,
 869                     p_src,
 870                     __MIN( p_pic->p[i_plane].i_pitch,
 871                            p_vdec->p_context->i_stride[i_plane] ) );
 872             p_dst += p_pic->p[i_plane].i_pitch;
 873             p_src += p_vdec->p_context->i_stride[i_plane];
 874         }
 875     }
 876
 877     vout_DatePicture( p_vdec->p_vout, p_pic, p_vdec->i_pts);
 878     vout_DisplayPicture( p_vdec->p_vout, p_pic );
 879
 880     return;
 881 }
 882
 883
 884 /*****************************************************************************
 885  * EndThread: thread destruction
 886  *****************************************************************************
 887  * This function is called when the thread ends after a sucessful
 888  * initialization.
 889  *****************************************************************************/
 890 static void EndThread( videodec_thread_t *p_vdec )
 891 {
 892     int i;
 893
 894     if( !p_vdec )
 895     {
 896         return;
 897     }
 898     msg_Dbg( p_vdec->p_fifo, "cinepak decoder stopped" );
 899
 900     for( i = 0; i < 3; i++ )
 901     {
 902         FREE( p_vdec->p_context->p_pix[i] );
 903     }
 904
 905     free( p_vdec->p_context );
 906
 907     if( p_vdec->p_vout != NULL )
 908     {
 909         /* We are about to die. Reattach video output to p_vlc. */
 910         vlc_object_detach( p_vdec->p_vout );
 911         vlc_object_attach( p_vdec->p_vout, p_vdec->p_fifo->p_vlc );
 912     }
 913
 914     free( p_vdec );
 915 }
 916
 917